11113331221 has 2 divisors, whose sum is σ = 11113331222. Its totient is φ = 11113331220.

The previous prime is 11113331213. The next prime is 11113331227. The reversal of 11113331221 is 12213331111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8855751025 + 2257580196 = 94105^2 + 47514^2 .

It is a cyclic number.

It is not a de Polignac number, because 11113331221 - 2³ = 11113331213 is a prime.

It is a super-2 number, since 2×11113331221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11113331227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556665610 + 5556665611.

It is an arithmetic number, because the mean of its divisors is an integer number (5556665611).

Almost surely, 2^11113331221 is an apocalyptic number.

It is an amenable number.

11113331221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11113331221 is an equidigital number, since it uses as much as digits as its factorization.

11113331221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 19.

Adding to 11113331221 its reverse (12213331111), we get a palindrome (23326662332).

The spelling of 11113331221 in words is "eleven billion, one hundred thirteen million, three hundred thirty-one thousand, two hundred twenty-one".